Visual Studio 2012, IIS Express, and Fiddler

From the mail bag… Q:When I use IE10 on Windows 8 to visit an IIS Express instance using the following URL http://ipv4.fiddler:2468/, I get an unexpected error message. HTTP/1.1 400 Bad RequestContent-Type: text/html;charset=us-asciiServer: Microsoft-HTTPAPI/2.0Date: Wed, 22 Aug 2012 19:59:52 GMTConnection: closeContent-Length: 334 <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01//EN”””><HTML><HEAD><TITLE>Bad Request</TITLE><META HTTP-EQUIV=”Content-Type” Content=”text/html; charset=us-ascii”></HEAD><BODY><h2>Bad Request – Invalid Hostname</h2><hr><p>HTTP Error 400….


Update on Fiddler Telemetry

Back in October of last year, I blogged the results of some surveys and announced that some telemetry features would be added to the Fiddler beta builds. Now that 10 months have passed, I’ll provide an update on how things are going. SmartAssembly Telemetry Microsoft products use the Customer Experience Improvement Program (CEIP, sometimes called…


Find Proxy Authentication bugs with Fiddler

Over on my other blog, I just posted an article showing how you can use Fiddler to find bugs in applications that don’t expect authenticating proxies.